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Not Intended For Any Earlier Philips Respironics Model System One 50 Series. This Shielded DC Cord is Unique To The System One 60 Series.
Once The Heated Tube Was Added To The 60 Series The 12 VDC Adapter Was Changed in Size Requiring A New Shielded DC Cord Design.
The Connector Configuration Changed To A Different Barrel Connector Than On The 50 Series.
To Run Directly From Battery Terminals Purchase The DC Power Kit 1099011 Or The Battery Adapter Cable 532209.